<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>无边框表格</title>
</head>
<body>
<table>
  <tr>
    <td>100</td>
    <td>200</td>
    <td>300</td>
  </tr>
  <tr>
    <td>400</td>
    <td>500</td>
    <td>600</td>
  </tr>
</table>
</body>
</html>